Grails render as JSON catch

output

$ curl localhost:8080/example/restJsonCatch/grailsJson
{"first":"foo","second":5}
$ curl localhost:8080/example/restJsonCatch/netSfJson
{first=foo, second=5}

RestJsonCatchController.groovy

class RestJsonCatchController {

    def grailsJson() {
        render([first: 'foo', second: 5] as grails.converters.JSON)
    }

    def netSfJson() {
        render([first: 'foo', second: 5] as net.sf.json.JSON)
    }
}